The Cyber-Leader served as leader of the Cybermen of another universe.
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During the 2007 invasion of the Doctor's Earth, the Cyber-Leader was identified by black handle bars on its helmet. When the Leader was destroyed, the information it had was downloaded into another Cyberman who would be upgraded to Cyber-Leader. The first leader during the meeting with the Doctor was destroyed by the Preachers whilst the second was slain by Yvonne Hartman in her converted form. (DW: Army of Ghosts / Doomsday)
Another Cyberleader turned up in 1851, although this design of Cyberleader was actually known as a CyberLord. This leader had black handle bars and a redesigned black face plate with a transparent "window" through which its brain could be seen. This Cyberlord was destroyed by the CyberKing. (DW: The Next Doctor)
When the Cybermen joined The Alliance formed to imprison The Doctor in the Pandorica in order to save the Universe, the Cyber-Leader which fought in the Battle of Canary Wharf, led them to Stonehenge, 102 A.D. along with the rest of the Alliance and locked the Doctor in the Pandorica. (DW: The Pandorica Opens)
The Alliance's plan failed however, and as a result, several species, including the Cyberman, were wiped from existence, leaving only stone "after-images" behind. When the Doctor reset the universe and timeline, The Cyber Leader along with all things that were destroyed throughout history, were restored to their original form and place in space and time. (DW: The Big Bang)
See also
- John Lumic, the Cyber-Controller.